Photo shows a view of Tiankeng Difeng (a giant sinkhole and ravine) scenic area in Fengjie County, Chongqing municipality. A couple has lived on a cliff in the area for more than 20 years. As the only residents of Tiankeng Difeng, the couple earns a living by doing sanitation work in the scenic area, as well as through maintenance of a local hydropower station. (Chinanews.com/Chen Chao)

Wife cleans the stairs at the Tiankeng Difeng scenic area in Fengjie County, Chongqing municipality, Sept. 13, 2016. (Chinanews.com/Chen Chao)

Husband collects rubbish around the Tiankeng Difeng scenic area in Fengjie County, Chongqing municipality, Sept. 13, 2016. (Chinanews.com/Chen Chao)

Couple poses for a photo in their home on a cliff in the Tiankeng Difeng scenic area in Fengjie County, Chongqing municipality, Sept. 13, 2016. (Chinanews.com/Chen Chao)

The couple's kitchen in their home in Tiankeng Difeng scenic area in Fengjie County, Chongqing municipality, Sept. 13, 2016. (Chinanews.com/Chen Chao)

Wife sits in front of their home in Tiankeng Difeng scenic area in Fengjie County, Chongqing municipality, Sept. 13, 2016. (Chinanews.com/Chen Chao)